Field updates are normally caused by workflows and triggers.  Some workflows are managed components that are part of the Luminate CRM package.  Other workflows like field updates that are created locally can be deactivated.

To make changes to workflows and field updates:
  1. In Luminate CRM/Common Ground select Setup.
  2. Select Create > Workflow & Approvals.
  3. You can select Field Updates or view Workflow rules from here.
  4. If you find a particular process that is not a managed component you can select to edit and modify the functionality or deactivate.